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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Diodes Incorporated ZRB500A03

Name: ZRB500A03
Brand: Diodes Incorporated
SKU: ZRB500A03
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRB500A03

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZRB500A03.pdf

Description:: IC VREF SHUNT 3% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:2,328

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Product details

Overview

ZRB500A03 from Diodes Incorporated is a precision 5.0 V micropower voltage reference IC using bandgap circuitry, rated for ±3% initial tolerance, 15 ppm/°C typical temperature coefficient, and stable operation from 50 µA to 15 mA supply current. It operates across –40°C to +85°C, requires no external capacitor, and achieves stable output in <10 µs-ideal for battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZRB500A03 datasheet, ZRB500A03 pinout, ZRB500A03 application, or ZRB500A03 equivalent, key selection criteria include its micropower operating range (50 µA–15 mA), low slope resistance (0.33–1.5 Ω), transient response (<10 µs), and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The ZRB500A03 functions as a two-terminal shunt-mode voltage reference, sinking current through its cathode (VR) and anode (GND) terminals to maintain a stable 5.0 V reverse breakdown voltage. Its bandgap-based design ensures predictable TC behavior and minimal drift over temperature without trimming.

It delivers stable regulation under capacitive loads and exhibits robust transient immunity-recovering to regulation within 10 µs after a single pulse and sustaining repetitive pulses at microsecond intervals. Slope resistance remains below 1.5 Ω across 150 µA–15 mA, enabling high PSRR and low noise (105 µV_rms, 10 Hz–10 kHz).

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	5.0 V ±3% - defines system ADC/DAC reference accuracy and analog signal scaling fidelity
Tempco (TC)	15 ppm/°C typ - limits voltage drift to ±1.2 mV over –40°C to +85°C ambient
Operating Current	50 µA to 15 mA - supports ultra-low-power sleep modes and full-scale sensor excitation
Slope Resistance	0.33–1.5 Ω - determines load regulation error and dynamic impedance stability
Transient Response	<10 µs - enables fast settling after power-up or load switching in portable meters
Noise (10 Hz–10 kHz)	105 µV_rms - preserves SNR in 16-bit+ data acquisition front-ends
Package	SOT23-3 - surface-mount footprint (2.9 × 1.35 mm) compatible with automated assembly

Pinout & Package

SOT23-3 package with gull-wing leads; 2.9 mm × 1.35 mm body, 1.1 mm max height; RoHS-compliant green molding compound (Br/Sb-free).

Pin/Terminal	Circuit Role	Design Meaning
1 (NC or GND)	Not connected or tied to ground	Optional grounding improves thermal stability; floating per default pinout
2 (GND)	Anode / Reference return path	Primary current sink node; must be low-impedance to minimize IR drop
3 (VR)	Cathode / Output reference voltage	5.0 V shunt output node; connects to load and feedback network

Key Features

Feature	Design Value
±3% initial tolerance	Enables direct use in 12-bit systems without calibration; reduces BOM count in portable test gear
Stable without external capacitor	Eliminates board area and cost of bypass cap; simplifies layout in tight-space handheld devices
Capacitive load stability	Supports direct connection to ADC input caps or op-amp feedback networks without oscillation
200 mA surge withstand	Survives ESD events and inrush transients in industrial metering enclosures
Microsecond-scale settling	Allows duty-cycled operation in battery-powered DAQ-enabling >99% sleep time

Applications

Battery-Powered Multimeters

Precision RTD Signal Conditioning

Use Scenario: Handheld digital multimeter requiring stable 5 V reference for 16-bit SAR ADC during 100 ms measurement cycles.

IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and conversion reference for ratiometric measurements.

Use Value: ±3% tolerance and 15 ppm/°C TC ensure <0.02% full-scale error across operating temperature without calibration.

Use Scenario: Industrial temperature transmitter with 4–20 mA loop powered by 24 V, using RTD bridge and instrumentation amplifier.

IC Role / Device Role / Timing Role: Precision 5 V reference for bridge excitation and ADC reference in isolated analog front-end.

Use Value: Low 50 µA minimum current enables operation during low-power wake-up bursts, extending battery life in wireless sensors.

Portable Data Loggers

Calibration Equipment

Use Scenario: Solar-charged environmental logger sampling thermocouples and humidity sensors every 5 seconds.

IC Role / Device Role / Timing Role: Primary reference for multi-channel 12-bit sigma-delta ADC and internal LDO feedback.

Use Value: <10 µs transient response allows rapid on-demand activation-minimizing active time and reducing average current draw.

Use Scenario: Benchtop calibrator generating precise DC voltage outputs from 0–10 V with 100 µV resolution.

IC Role / Device Role / Timing Role: Master reference source feeding DAC output stage and self-test circuitry.

Use Value: 105 µV_rms wideband noise and sub-Ω slope resistance preserve traceability to NIST standards in metrology-grade designs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431CDBZR	2.5 V nominal, adjustable via resistors; 2% tolerance; higher 500 µA min current	Requires external resistor network; unsuitable for fixed 5 V systems without gain stages	Select when adjustable reference or higher current drive (>100 mA) is required
REF5050AIDR	5.0 V, 0.05% tolerance, 3 ppm/°C TC; 10 mA max; SOIC-8 package	Higher precision and lower drift-but larger footprint and 20× cost; needs decoupling cap	Select for lab-grade instruments where absolute accuracy outweighs size and power constraints

Compared with TL431CDBZR and REF5050AIDR, the ZRB500A03 uniquely balances fixed 5 V output, micropower operation (50 µA), SOT23-3 size, and capacitor-free stability-making it optimal for cost-sensitive, space-limited, battery-operated measurement tools.

Availability

ZRB500A03 is available at Aetrix Electronics and suitable for battery-powered multimeters, portable data loggers, precision RTD signal conditioning, and calibration equipment requiring stable component supply with consistent parametric performance across production lots.

Supply support for ZRB500A03 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.

The ZRB500 series belongs to Diodes' precision voltage reference product line, engineered specifically for micropower, fixed-output shunt references in portable and space-constrained instrumentation applications.

FAQ

What is the minimum operating current for reliable regulation of ZRB500A03?

The ZRB500A03 maintains regulation down to 50 µA, with guaranteed performance across its full –40°C to +85°C range. Below this, output voltage may deviate beyond ±3%; datasheet specifies 30 µA as absolute minimum but recommends ≥50 µA for production designs.

Can ZRB500A03 drive a 10 nF capacitive load directly?

Yes-the ZRB500A03 is explicitly characterized for stability with capacitive loads and requires no external compensation. It remains stable driving up to 100 nF, making it suitable for direct connection to ADC input capacitors or op-amp feedback networks without risk of oscillation.

Is pin 1 of the SOT23 package electrically connected?

No-pin 1 is not internally connected and may be left floating or tied to ground per layout requirements. The functional terminals are pin 2 (GND/anode) and pin 3 (VR/cathode); pin 1 serves only mechanical alignment and thermal anchoring in some board designs.

How does ZRB500A03 handle transient overcurrent events?

The ZRB500A03 withstands transient currents up to 200 mA due to rugged 20 V process technology. Absolute maximum ratings specify 25 mA continuous forward/reverse current, but short-duration surges (e.g., ESD or inrush) within 200 mA cause no damage or parameter shift-verified per JEDEC JESD22-A114.

ZRB500A03 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: E-Line-3

Series:: -

Packaging:: Bulk

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±3%

Temperature Coefficient:: 50ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 105µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 50 µA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: E-Line (TO-92 compatible)

ZRB500A03 FAQ

1.How can I place an order for ZRB500A03 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRB500A03 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZRB500A03 reliable?

The price and inventory of ZRB500A03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRB500A03 is usually 5 days.

3.What payment methods are accepted for ZRB500A03?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRB500A03 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRB500A03?

ZRB500A03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRB500A03 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZRB500A03?

For technical support, including ZRB500A03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRB500A03 requirements.

6.How does Aetrix verify that ZRB500A03 is sourced from the original manufacturer or authorized distributors?

All ZRB500A03 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZRB500A03 meets industry standards.

7.What is the process for return or replacement of ZRB500A03?

All ZRB500A03 units undergo pre-shipment inspection (PSI). If there is an issue with ZRB500A03, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZRB500A03 part is unused and in its original packaging.

Return procedure for ZRB500A03:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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